/*
 * Copyright 2011 Clean GWT
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package com.cleangwt.validation.client;

/**
 * A validation to validate values deferred, its validation result may not returns immediately. and
 * just use {@link DeferredErrorReporter} to report the validation result when the validation is
 * finished later.
 * 
 * @author Jess
 * @version 1.0
 * @since 1.0
 */
public abstract class DeferredValidation extends Validation {

  protected DeferredErrorReporter errorReporter;

  /**
   * Creates a deferred validator with the given groups.
   * 
   * @param groups the groups
   */
  public DeferredValidation(String... groups) {
    super(groups);
  }

  /**
   * Sets the {@link DeferredErrorReporter}.
   * 
   * @param errorReporter the errorReporter
   */
  void initialize(DeferredErrorReporter errorReporter) {
    this.errorReporter = errorReporter;
  }

  @Override
  public String validate(Object[] values) {
    if (Checks.hasEmptyValue(values)) {
      return null;
    }
    validateDeffered(values[0]);
    return ValidationMessages.Impl.remote();
  }

  /**
   * Validates deferred.
   * 
   * @param values the values to validate
   */
  protected abstract void validateDeffered(Object value);

}
